6in Lathe Chuck Soft Jaw Press
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Form copper soft jaws on a 20mm wide jaw for holding soft parts with a 3 or 4 jaw chuck
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I have a set of 6in 3 and 4 jaw chucks from precision matthews. The jaws are 20mm wide each and are pretty similar. I suspect it will work for most chucks in that size. the 4 jaw has 90 degree cuts and the 3 jaw has 120 so they all come together correctly.
I included a cut template to help get the copper right to start with. I used a metal bandsaw and 1mm thick copper sheeting. You could go thinner, but I wouldn't want any thicker. Use the form to fold the T shape around the individual jaw, then use a little hammer to fold the tabs over.
I suggest printing these things pretty stout. I used PLA, 4 layers, and about 25% infill. I made 5 or 6 inserts for my 4 jaw and the form is still in good shape.